162 строки
3.5 KiB
C
162 строки
3.5 KiB
C
/*
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* This file is part of wl1251
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*
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* Copyright (C) 2008 Nokia Corporation
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*
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* Contact: Kalle Valo <kalle.valo@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include "wl1251_reg.h"
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#include "wl1251_ps.h"
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#include "wl1251_cmd.h"
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#include "wl1251_io.h"
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#define WL1251_WAKEUP_TIMEOUT 2000
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/* Routines to toggle sleep mode while in ELP */
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void wl1251_ps_elp_sleep(struct wl1251 *wl)
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{
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if (wl->elp || !wl->psm)
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return;
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wl1251_debug(DEBUG_PSM, "chip to elp");
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wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
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wl->elp = true;
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}
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int wl1251_ps_elp_wakeup(struct wl1251 *wl)
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{
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unsigned long timeout;
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u32 elp_reg;
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if (!wl->elp)
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return 0;
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wl1251_debug(DEBUG_PSM, "waking up chip from elp");
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timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
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wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
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elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
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/*
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* FIXME: we should wait for irq from chip but, as a temporary
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* solution to simplify locking, let's poll instead
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*/
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while (!(elp_reg & ELPCTRL_WLAN_READY)) {
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if (time_after(jiffies, timeout)) {
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wl1251_error("elp wakeup timeout");
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return -ETIMEDOUT;
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}
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msleep(1);
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elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
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}
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wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
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jiffies_to_msecs(jiffies) -
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(jiffies_to_msecs(timeout) - WL1251_WAKEUP_TIMEOUT));
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wl->elp = false;
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return 0;
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}
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static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
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{
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int ret;
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if (enable) {
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wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
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ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
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if (ret < 0)
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return ret;
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wl1251_ps_elp_sleep(wl);
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} else {
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wl1251_debug(DEBUG_PSM, "sleep auth cam");
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/*
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* When the target is in ELP, we can only
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* access the ELP control register. Thus,
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* we have to wake the target up before
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* changing the power authorization.
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*/
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wl1251_ps_elp_wakeup(wl);
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ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
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{
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int ret;
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switch (mode) {
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case STATION_POWER_SAVE_MODE:
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wl1251_debug(DEBUG_PSM, "entering psm");
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ret = wl1251_acx_wake_up_conditions(wl,
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WAKE_UP_EVENT_DTIM_BITMAP,
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wl->listen_int);
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if (ret < 0)
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return ret;
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ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
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if (ret < 0)
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return ret;
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ret = wl1251_ps_set_elp(wl, true);
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if (ret < 0)
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return ret;
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wl->psm = 1;
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break;
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case STATION_ACTIVE_MODE:
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default:
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wl1251_debug(DEBUG_PSM, "leaving psm");
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ret = wl1251_ps_set_elp(wl, false);
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if (ret < 0)
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return ret;
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ret = wl1251_acx_wake_up_conditions(wl,
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WAKE_UP_EVENT_DTIM_BITMAP,
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wl->listen_int);
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if (ret < 0)
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return ret;
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ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
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if (ret < 0)
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return ret;
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wl->psm = 0;
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break;
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}
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return ret;
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}
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